
184 Batch Processing
Run an external task - you can choose to run an external application after batch
processing has completed using the "External Tool" tab. The external tool must be
set up first via the Configure external tools dialog. You can access this from Tools >
Configure external tools.
Define any options - choose any options using the "Options" tab and/or annotate
your batch using the "Comments" tab.
Choose any Multitasking options - if you have a multi-core processor in your com-
puter you can also choose how many tasks are completed simultaneously. You can
choose how many cores of your processor to dedicate to batch processing, adjusting
this setting even during processing.
Start processing - when you are happy with all the settings, choose Process > Start
or click the shortcut button to begin processing the batch. You can monitor the
progress of each task (and pause, cancel or reassign priorities on lengthier tasks) using
the Background tasks window. From the built-in Progress pane you can choose to
pause or cancel the batch at any time.
Batch the batch processor
As you may have noticed in the Plug-ins window, you can access Master Section plug-ins
and many of WaveLab's built in offline processes. In addition there are some plug-ins which
are unique to the Batch Processor Workspace and each is explained in more detail in Batch
Processing Plug-ins. Obviously the order in which you process plug-ins is important. You
can change the sequence by dragging the plug-in to the position you wish within the "Audio
Plug-in chain" list and releasing the mouse button.
For example, a typical batch processing effects chain might resemble the following:
DC Remover > Normalizer > Denoiser > Compressor > Limiter > MPEG Encoder
The batch processor operates using a number of processing passes. The number of passes
depends on the type of plug-ins you use. Some plug-ins require multiple passes of the
Audio File in order to determine how to process the audio, others can process in a single
pass. Besides the plug-ins shared with the Master section, there are three other types of
plug-in types available in the Batch Processor Workspace:
Monopass - these plug-ins only require one pass when processing.
Multipass - these plug-ins require two or more passes (an analysis and a process
pass). The Normalizer is an example of a Multipass effect.
Metapass - these plug-ins are unique to the Batch Processor and require several
passes before processing the audio. After analysing ALL Audio Files, a metapass
plug-in takes into account the analysis performed by itself on ALL these files, before
processing them individually in a second round. The Meta Normalizer is an example of
a Metapass effect.
Once all passes have been completed, the resulting file is written to your hard disk. It is
useful to note that WaveLab keeps the audio in the 32-bit domain for all calculations before
writing a file to disk. To optimize performance, all batch process calculations are performed
and stored in RAM rather than using temporary files.
WaveLab 7
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